Couplings and safety devices therefor



July 5, 1960 o. L. NORDIN 2,943,869

COUPLINGS AND SAFETY DEVICES THEREFOR Original Filed Feb. 25, 1959 5 Sheets-Sheet 1 Obe/z Z. Nora #7 INVENTOR.

BY f bz. W AZM ATTOH/VfYJ 0. L. NORDIN COUPLINGS AND SAFETY DEVICES THEREFOR July 5, 1960 Original Filed Feb. 25, 1959 5 Sheets-$heet 2 Obe/f A. A/ord/n INVENTOR. r

A TTOR/VfVJ July 5, 1960 o. L. NORDIN 2,943,869

COUPLINGS AND SAFETY DEVICES THEREFOR Original Filed Feb. 25, 1959 5 Sheets-Sheet 3 Obs/'2 z. A OraY/fl INVENTOR.

BY fpa 5 46m o. L. NORDIN 2,943,8 69

COUPLINGS AND SAFETY DEVICES THEREFOR 5 Sheets-Sheet 4 July 5, 1960 Original Filed Feb. 25, 1959 Oberf L. Nara n7 INVENTOR.

F W 0. Z M ,ZZM

ATTOR/VE VJ July 5, 1960 o. 1.. NORDIN 2,943,869

COUPLINGS AND SAFETY DEVICES THEREFOR 7 Original Filed Feb. 25, 1959 5 Sheets-Sheet 5 INVENTOR.

A A l Continuation. of application Ser. No.

in couplings and safety devices therefor. tion is a continuation-in-part of my applications Serial No. 485,680, filediFebruary 2, 1955, for Pipe Couplings; Serial No. 496,776, filed March 25, 1955, and Safety Devices Therefor; and a continuation of Serial No. 797,819, filed February 25, 1959, for Safety Devices Therefor.

which the coupling cannot be disassembled prior; to release of; fluid pressure within the coupling thus preventing any possibility of high pressure fluids becoming effec tive upon a free taken on line 2-2 of-Figure- 2,943,869- COUPLINGS AND. SAFETY nnvrcns rnnnnron:

Qbert L. Nordin, PA). Box 1184, H0ust0n, Tex.

797,819, Feb. 25, 1959;. ThisapplicationAug. 7, 1959, Ser. No. 832,187

12 Claims. (Cl. 285--9G) This invention relates to new and useful improvements This applicae for Couplings Couplings and An object of this invention is to provide. a new and improved coupling" or connecting device and a safety device therefor, wherein the safety device is adapted to prevent the disassembly or uncoupling of said coupling or connecting device, prior to the equalization of the fluid pressure within the coupling with the pressure exteriorly. thereof.

An important object of this invention is to provide a new andsimproved coupling vor connecting device and a safety device therefor, including means for warning the operator that the fluid pressure Within the coupling has not beenequalized with the fluid of;-prior to the disassembly or uncoupling of said coupling or connecting device.

pressure exteriorly there- Another'object" ofthis invention is to provide a new and improved safety device which is adapted for use with couplings and the like having" parts thereof which are releasablyconnected together, such safety device including a removable bleeder plug whichprevents the disassembly or uncoupling of said couplings-and, the like prior to the removal of said plug-therefrom.

Another object is to providea lug type coupling in part of the coupling. Another object is to provide a coupling as'in'the pre- Another object is. to provide av lug type coupling in which it isimpossible for, high pressurefluid to become eflfective upon a free part of the coupling.

The, construction designedw to.carry out the invention will be hereinafter described, together with other features thereof.

The invention will be more readily understood from a reading of thefollowing specification and by reference to the accompanyingdrawings. forming a part thereof, wherein an example 'of the invention is shown, and wherein:

Figure 1 is an elevation of the couplingor connecting device of this invention with the improved safety device therewith.

Figure 2is'asectional view of the coupling'of- Figure l Figure '3-is a sectional-view-similar to Figure 2, but

2,943,869 Fatented July 5, 1950 2 illustrating the coupling or connecting device, after dis-,. assembly thereof has, been attempted but prior to the removal of the safety device from the coupling or connecting device.

Figure 4 is a view, partly in elevation and partly in. section, illustrating the coupling or connecting. device of Figure, 1 after it has been moved to the positionof, Figure ,3.

Figure 5 is a view, partly in elevation and partly in, section, illustrating the safety device of this-invention in. use with a coupling or connecting device which is mounted; ona positive choke.

Figure 6 is a view, partly in elevation and partly in section, illustrating the safety deviceof this invention inuse with a coupling or connecting device mounted on an adjustable choke.

Figure 7 is a sectional view illustrating the coupling ofI' this invention in assembled position.

Figure 8 is an end view of Figure 7.

Figure 9 is also an end view of'the coupling illustratedj opposite end in Figure 7, but'viewing Figure 7 from the as compared to Figure 8.

Figure 10 is a development of the coupling illustrated, in Figure 8, theintersection' for such development being;

located at line Iii-10 of Figure 8.

In the drawings, theletter C designates the coupling. or; connecting device ofthisinvention which, as will be, referred to herein simply asia,

explained, is generally coupling C. The coupling C of this invention includes any coupling or connecting member which is adapted to. releasably connect together adjacent body sections such as The safet'y'device S of this invention C so that'such coupling sections a of pipe. is adapted for-use with a coupling 7 C cannot be disassembled or uncoupled prior to the equal; ization of the pressure within the coupling with the pressure externallyof'the coupling, as will be more evident hereinafter.

Consideringfirst the" form of the invention illustrated in Figures 14,' the coupling C'releasably, connects to? gether body sections 10 and 11, each of which is attached to or is integral with a pipe or some other piece of equipment (not shown). In the form of theinvention of Fig ures 1-4, the body section it takes the form of a plain, hub which is substantially cylindrical and which has an annular radially extending flange 10a which has a'seating An annular groove 10c shoulder 10b formed thereon. is provided in the inner end of the plain hub 10 for re: ceiving a part of a seal ring 12 which is formed-0f m'et'al or any other suitable material for forming -a fluidtight seal with the plainhub 10. The other body section 1 1 takes the form of a lug hub in Figures 1-4-and it has an annular recess 11a at its inner end in which the seal ring; 12 isalso adapted to extend'so that when the sections 10 and 11- are moved'together, the seal ring 12 is inisealing engagement with the walls or surfaces of thegroove's and 11a, whereby fluid is prevented from passing between the ends of the sections llisand 11.

An annular nut 18 surrounds the body sections 10 and 11. Near one end of the annular-nut 18, anan nular" inwardly extendingrshoulder 13a is constructed for contact with the outwardly extending shoulderltib of the plain hub or bodysection 18a and 1012 having the same inclination. The annular nut member 18 has a plurality. of lugs 20 formedat the end thereof opposite from said annular surface ISdwhich are adapted to co-actv with lugs: 2.1+on'the lug hub 'or body, section 11';

The lugs 20 and 21 are formed in segments (Figures. 2and 3) and have their -adjacent surfaces 20a and 21a inclined or wedge-shaped so that upon a rotation or turningflof the nut member 18 relative to the-lugfihub the coupling illustrated in;

lit), with the surfaces 'vents'theescape off. jA,stop:memberi40 'isformedintegrally.with, or.is V joth'erwise attached to, the p 40;. extends longitudinally. fi'oni the. nut

11,'the lug hub" 11 moved longitudinally or axially 'toward the plain hub or body section 10. Such hub construction is well known and is of the type illustrated in United States Patent No. 2,025,112, and although arm 25 formed therewith for receiving a bolt ,26 through,

the opening 251: in the arm 25 (Figure,4). The body section or lug hub'll also-has a bolt receiving 27' formed therewith .orpsuitably secured tthereto and such arm 27 has anopening (not shown) through which the b'olti26; 1 is adapted to extend when it isalsolextending. through the opening 25a; of the arm .25. A nut 28 is threadedon the end of the, bolt 26 opposite from the bolt head 26a so that the'annular nut 18 and the lug hub 11 aremoved toward each other as the arms 25 and 27 are moved toward each other during the tightening of the nut on the bolt 26.. Ordinarily, the 'nutl18 is tightened.

onth'e' body sections and llby turning the nut memberf 18 [relative thereto by striking one or more of the.

hammer proj'ecti'ohs'lfib with'a hammer or other-similar means'so asjro move the .arm -27" into alignment with thefarfm,25 for, readily positioning the-bolt- 26 through the respective openings inv the armszsam 27. Thus,

in the usual case ,the bolt' 26 with the .aut zs therewith servej to merelyjzhold the arms .25 and 27 1 against 1 niove- 1 .j mentfaway" from each other therebyfserving 'to.prevent. t a movementoi the nut' 18 relative to the section 11 LS0 long as such condition exists, the seal ring 121is main- 'tained under adequate "compression to prevent a fluid l leakagehround smez H V e. 7 Since the 'pressure withiu the coupling' C tha t'is, with ,in the bores of the body sections 10 'and, 11, is often extremelyl high, it is dangerous rto disco nnect ordisassemble .the parts of the couplin g without first bleeding 7 or releasing the pressure within the couplingC so as 7 to equalize. samewith' the pressure of the atmosphere' or. the fluid. externally of 'therco'upling C. 'Iihe safety 4 a t positioned with respect to the arm that it is adapted to contact the plug upon rotation of the nut'18 from its locked or wedged position (Figures 1 and 2). Ordinarily, with theib'olt 26 in place in the arms 25 and 27, the lateral surface a is spaced from the shank 33 of thetplug 30. The inclined surface 40b is inclined when the :lateralsurface 40a moves sufiiciently so that into contact with the shank 33, the surface 40b is spaced from the head 31 of the plug 30, whereby substantially no bending moment is applied to the plug" 30 if the nut member -18 is attempted to be rotated or turned While the plug 30 is in its seated position/As will be explained hereinafter, the space between the latferal surface 40a and the'shank 33 issuch that upon. 1 the removal of the bolt 26 from the arms 25 and 27, the nut member 18 fcan be moved a sufiicient distance I to unseat the seal ring 12 (Figure 4) sufficiently to per mit the fluid'under pressure .withiuthe body sections; 10

and 11-to flow around theseal ring '12'ar1d outwardly. be;

tweenrthe spaces adjacentthe. lugs 20 and '21. i p'lhus,"

. the, spacebetween 'the lateral surface 401; and the shank devices of this invention prevents the disassembly or uncoupling ofithe annular nut lsfrorn the body sections '10 and 11 riorto the release of the pressure of I thefluid within the coupling C so to equalize same. with pressure exteriorly 'of th e coupling (3.; V for accomplishingsuch safety featurerthe safety'device,

Sincludes a plug 30 which has ahead 31 with itsgsides to the threaded portion rof'jthelplugflll by lmeans of ternally V threaded i011 receiving corresponding external cates with the. interior ofthelrbody section 11 and also communicates. with vthe passage 320 which extends laterallytherefronii. Such lateral passageior opening .320 a J is, formed below the shank 33 andj'in order to prevent leakage from the interior of the body section 11 'out- .wardly through the openings 32b and 320 when the cou- 'pling'C-is inits assembled position (Figures 1. and'Z),

a. resilient ring;.35 formed of rubber or 'other elastic f; resilient-material is seated 'on an" annular gasket seat 7 11c and it extends radially inwardly so that the shank' 33iis adapted to:place the seal ring 351under compresa 1 sioiljwhen the'plug'30 is" seatedl Thusfwith the plug30 'inits'fullyiseatedposition, the seal ring.35 prefluid' -from the 'interior :of'xthe cou nut: 18.11 i'Th'e. stopmember 18; andr is' so fre d i 24 f the. 'th ade r r of Lille P1119 3 0. l"he' threaded portion fiz ofr' the/plug 30 has a longitudjnal'passa'ge .or opening 32b which communi-i formedito receive a wrench. The 'head 3 1 is connected,

pressures upto and greater,

pling C. but .theQ-fiuid "slowly escape. around 'in} a"hissing,1and in; sorne*casesla scre hingthe operator that the plug. F

V hasnot been removed. Such warning' oocurs prior to; the,-time thatthewcoupling' C has.-?been disassen bled or uncoupled so the 'Which serves "to warn through the openings 32b'aud 32;, so that the forthe leakage around the seal ringlz'to give the warning signal has been eliminatedf 1 e 7- it will be appreciat d'lhatthe coupling pressure. 'Ifstrip and the plug would su can be applied to the threads.v plished by weakening the plug portion 3221and the wrench part beiaccomplished by reducing the cross before threads I ofthis invention,

* nallys a zm ve t elug zfi through the spaces between i thelugs 21.; Such longitudinal moyement,051 6 huts-1 1;; islcontiuued the ianhulaiisurface, 181i :issubstautia y 33 is sufiicient to permit the turning of'the nut 'm ember 18a distance to permit leakage ofthe' fluid under pres-I sure around the seal ring-'12.] sincelthe lateral face 40a is that time in contact with thef-shank l aftf of the plug 30,.the, nut-member 18;;djoes not" permit the disassemblyforuncoupling of theparts or n eces;

under pressure l -i's permitted to?..

i the seal which;

within the bore of the body;'

section 11, has already been bled or released gradually From the above cannot be disassembled without removing plug .30. How; I

ever, the plugitself presents apossible danger pointasp-.ia' workman may tighten the plug while the coupling is under than 15,000 p.s.i. anda .free plug would be extremely dangerous; @This contingency;

can be guarded against byfemploying a plug whose threads cannot be stripped The plug threads maybe protected in any desired manner which will limit the groove. 30a.

at this point as by sures within the coupling. The operation or use evident from the foregoing description.. I Basically, Jsi'leh operation oreruse includesthe initial assembly'rof member 1 8 onthe body sections 10and1l That is'prefg f t erably accomplished by; :the nutlmemberis longir tudinally from the body section or plain hub 10 longitud no danger existsat that timetoi: .-the' operator. Of course, it the plug, 3,0}has been re j; moved prior to the release of the bolt 261 mm the arms 25 and 27, then thepressure from the coupling C, and more particularly; from necessity 5 sufiici'enttorque isapplied threads 32a may 1 denly' be freed while subject-1 to coupling pressure, .These couplingswill be subjecte'dto the torque which Preferably this is accom n intermediate the: threaded" V 31. Such weakening may;

section of 'the'plug "'I'he'depth of the} groove 30a should be such thatwhen 'excessiveitorqueisf 1 applied .to wrench part 31 the plug will'shear at groove 3011 7 e I 32a are damagedarflhus thereiis' provided" a completely safelug type coupling in whichino' part of the coupling can beifreed while subject'toelevatedprese t harming ry de'vieff as. illustrated in Figures 1-4, S beli l V in complete contact with the annularsurface 101) of the plain hub 19. At that time, the nut member 18 is rotated or turned so as to cause the adjacent faces 20a and 21aof the lugs 20 and 21, respectively, to slide relative to each other. Since such surfaces 20a and 21a are inclined or wedge-shaped, the relative movement of the nut member 18 and the lug hub 11 effects a longitudinal movement of the nut 18 and the hub 11 toward each other so as to move the sections and 11 toward each other to compress the seal ring 12 in fluid-tight sealing engagement in the respective grooves 100 and 11a. The turning of the nut 18 relative to the lug hub 11 is continued until the arms 25 and 27 have their respective openings aligned so that the bolt 26 can be positioned therethrough. Such turning of the nut member 18 can be done by hand, but generally the hammer projections 185 are contacted with a hammer to eifect the final tightening. With the bolt 26 in position in the arms 25 and 27, the nut 28 is tightened. Then, the plug 30. is threaded into the threaded opening 11b so as to form a fluid-tight seal with the seal ring-35 to prevent any. possibility. of fluid escaping through the passages 32b and 320 of the threaded portion 32 of the plug 39. When the plug 30 is thus positioned, the lateral surface 49a of the. stop member 49 is spaced from. the shank 33. of the plugiiitlas indicated in Figure 2.

When it is desired to disconnect or disassemble the coupling. C, the operator should first remove the bleeder plug 30. by unthreading same from the threaded opening 11b in. the body section 11. As the plug 30 is thus rotated,

by means of a wrench which is applied'to the wrench head 31, the lateralzpassage 32a is initially exposed so that fluid under. pressure is allowed to bleed or escape slowly through the passages 32b. and, 320 from the interior of the body section. 11; In that manner, the pressure within the body section 11 is gradually equalized with the atmospheric pressure or other fluid pressure externally of the coupling C; Of course, when the plug 30. has been completely removed, the fluid under pressure gives a hissing sound to warn the operator, or if the master valveon the well;is closed as is the usual case, then the pressure internally and eateriorly of the coupling Cisequalized. With the plug 30 removed, the nut member 18;is,free to move Without any obstruction upon the removal, of the bolt 26, from the arm 25 and 27.

Froml the above procedure, it will be evident; that the disassembly of the coupling C is substantially the same as that performed with a normal coupling or connecting device, except that the safety plug 30 must be removed prior to the turning of the nut member 18. However, if the plug 3% is not removed, such plug30 co-acts with the stop member 40 to preveuttherelease of the nut member 18 from the body sectionslt) and 11, even though the bolt 26 has been removed.

Thus, assuming that the operator, in disassembling the coupling C, has forgotten to remove the plug 38 but he has removed the bolt 26 from the arms 25 and 27, when he applies a hammer or other means to the nut 18 for effecting a rotation thereof relative to the body section 11, the lug 40 will move with the nut m mber. .5 so as to cause the surface 40a thereof to abut or contact the shank 33 of the plug 3% Such abutment results in the stopping of the turning or rotational movement of the nut member 18. relative to the body section 11.

Due to the fact that the lateral surface 49a is spaced from the shank 33 under normal conditions with the bolt 26 and the arms 25 and 27, a slight amount of turning of the nut member 18 relative to the body section 11 is permitted; Such slight amount of relative movement between the nut 18 and the body section llcauses the parts to move to the position shown in Figures 3 and 4 and willciently releases the compression on the seal ring 12 to cause leakage around the seal ring 12-from the interior of the body sections 10 and 11. Such leakage of fluid under high pressure results in a hissing, and in some cases a screeching, sound which'serves to warn the operator that he has failedto bleed or release the fluid pressure-from within the coupling C or the parts connected thereto. The operator can then return the nut 18 to its locked position and with the bolt 26 reinserted, can then remove the safety bleed plug 30 in the normal manner to bleed off the pres sure within the body section 11. i

It is therefore believed evident that the safety device S which is used with the coupling C of Figures 14 not only prevents the release or disassembly of the coupling C prior to the equalization of the fluid pressure within the coupling C with that pressure exteriorly thereof, but also-it provides a means for warning the operator when he has. failed to effect such equalization prior to the disassembly of the coupling C. In some cases it may not be desirable to use the warning and in such cases the lateral surface 40a of the stop member 40 cm be in abutment with or in substantial abutment with the shank- 33. of the plug 36 when the coupling C is in its assembled position with. the bolt 26 inplace.

in Figure 5, the safety device S is shown in use with the coupling or connecting member C mounted on apositive choke used in oil Well operations. The safety device S is identical with that illustrated'in Figures L4 and functions in the same manner. The coupling or connecting member C is the same as that illustrated in. Figures 1-4 and bears like numeralsfor like parts, with the exception of the body sections 119 and 111 which are somewhat modified in Figure 5 as comparedwithFigures. 1-4. Thus, the body section 11b in FigureS takes the form of a closure cap or disk rather than a cylindrical pipe as indicated by the numeral 19 in Figures 1-4. The body section 111 is substantially the same as the body section 11 of Figures l-4, except that it is a part of the choke body, such choke beingidentified by the letter P.

The choke P is of the positive type and has the body section 111 formed in a substantially T-shape with the flow bean F being of conventional construction. As is well known, positive-type chokes such as indicated by the letter? in Figure 5 have a body portion 1110 which is adapted to be welded or otherwise secured to a pipe leading from the oil Well, whereby oil or other fluid under pressure is adapted to flow upwardly throughthe tubularportion lillc and then through the flow bean F. The fluid Within the choke P is therefore ordinarily underconsiderable pressure. if it is necessary to replace the flow bean F, the closure 11% must be removed.

' The removal of the closure 11% is elfected in the same manner as explained above in connection with Figures l4-. The safety plug 39 must be initially removed so that t e pressure within the choke P is permitted to bleed orgradually escape so as toequalize such fluid pressure within the choke P with the atmospheric pressure or other pressure externally thereof. Thereafter, the bolt- 26- is removed and the nut member 18 is rotated relative to the body section 131 to position the lugs 20between' the lugs 21 so that the nut member can then be moved axially or longitudinally (to the left in Figure 5) so-as to slide the nut member 13 off the body section Hi; It will be evident that as the nut member 18 is moved off the bodynection with Figures l-4 so that the seal;ring 12 is released from its full compression-t0 permit a leakage of the fluid Within the choke P around the seal ring 12 to effect a Warning to the operator by the hissingnoise-from the escaping fluid under pressure. Thus, the operation of the device of Figure 5 is identicalwith that described above in connection with Figures 1-4.

In Figure 6, the safety device S is illustrated in use with a coupling or connecting member C which is mounted on an adjustable-type-choke A. The'safetydevice'S is identical Wlthlllat illustrated in Figures- 1-4fand functions inthe same: manner. The coupling C issubstantially identical with that illustrated in Figures 1 4 and:

r in the death of the operators. 7

in connection with Figures 1-5; the plug 30 is-first rethe body-section'210 takes the form of a bonnet through which the adjustable choke needle 60 extends.

section211' takes the form of the housing or body of the j adjustable chokeA 'andthas therewith a tubular portion 211c ,which'is adapted to be connected with a pipe on an oil well or the like. -Fluid under pressure is, therefore, ordinarily admitted intothe interior of the adjustable choke A. When the needle 60 is moved axially'or longi- I tudinally to they-right in'FiguIe'6 from the flow bean F,

the flow bean F' is open and permits the fluid to flow therethrough' under controlled conditions, in the well 1 7 known manner. 'Also, as is well known, the needle 60 can be adjusted longitudinally or, axially relative to the flow'b'eari Ff by the rotation of thehandle 61 which eflects aturningof the needle 60 and by reason of the threads 60a engaging with the internal threads 210d in the body section 210, the needle 60 is moved longitudinally. A set screw-63 is provided for holding the needle 60 me predetermined position as indicated on the scale 64. It willlalso be observed that the body section 210 carries packing65 inthe usual manner. for sealing around the needle 60. Thus, it is believed evident thatexcept for the particular coupling C and thesafety device therewith, the adjirstablefichoke Agis of a well known fconstruction. i j i V lnithe operation or? use of the adjustable choke A, it

1 .often'becomes' necessary or desirable to replace'the flow bean F',stem 60, pr other internal parts of the, choke "A, and to effectsuch replacement the bonnet 21!) with the The body and, "as will be explained, the coupling A is so constructed that it is releasably connected for rapid assembly and V d-isassembly.

The coupling A includes a plain hub 310 which is con-' nected with one section of pipe P'by annular weld 310a or any other suitable type of connection.) Theplainhub- V 310 is substantially cylindrical and has an external annular flange 311; The other section of pipe'sP is con-t nected to alug hub 312 at annular weld 312a or by any other suitable connection. The log hub 312 has a'plu rality of circumferentially spaced lugs 314. A seal ring 31 is disposedbetween the adjacent ends of the hubs; 3-10 and 312 and fits into the annular openings 31%: and 312B of the hubs 310 and 312, respectively; to form f afluid-tight seal between the hubs 3 and 312, whereby pipes P to the other pipe P when the coupling Afis in,

the assembled 'position (Figure:7 The seal ring- 315 is? a formed of metal, although it will be appreciated that the material thereof maybe varied so long as it is capable of forming a fluid-tight seal'bet ween the hubs 310iand V A nut member 315 surrounds the coupling'hubs :andSlZ and -maintainss'anie inlanrassembled position The hub 3-15 is substantially cylindricalg with'radially extending'projections 315a being provided to facilitate 7 handling .and turning of the nutmember315. Thenutfl 4 'member 315 is not threaded,but the ibore thereof has stem 60' and related parts must be removed so as to 'obi tain sufficient room to position a wrench or other tool within'. the bodyz se'ction 211 for unthr'eading the flow bean F from its seated position. 'ln releasing the coupling C so as to release'the body section 210 from the a body section 211, the same. precaution must be observed as explained 'above in connection with Figures 1- In; other words,'the' fluid pressure within the adjustable choke A mustbe released prior to the disassembly of the coupling C'or otherwise such parts are subject to being;

a hurled through theair by reason of the rapid release of pressure during the disassernbly of the coupling. Such hurling or throwing o'ftthe'parts'of the coupling C by releasing same underhigh pressure without previously bleeding oli such fluid pressure has been known to result Thus, as explained above moved to, bleed or gradually release the fluid pressure from within the coupling 6 and the adjustable choke A, and thereafter the bolt 26 is removed so that'the nut 'member 18 can be moved relative to the, body section 7 2111mm such nut member-18 is in position for moving the lugs 20 thereof between the lugs 21 of the body sec-' tion" 211 for' axially or longitudinally displacing the nut lfi'from thebody setion 211. As soon as the nut 18 has a thus been released from the body section 211, it will be 7 evident that the body section 210 and the parts mounted V therewith can then readily be disconnected from the body anoinwardly extendingrflan ge 316 which has a inclined; :1, face or surface 316a extending around'the entire area thereof, and such fabefiztis adapted to contact af I similarly inclined orslo ped surface 311a of the annular I, flange 311cm the plain ,hub3l0a The nut member '315 i also has a; plurality ofoir c'urnterentially spaced andiinwar-dly extending lugs317. The spaces between the lugs 317 are suchthatthe lugs 314 on the lug hub 312 are; adapted topass between the lugs 317 so that upon a ing fof the nut member 315 relative to the hub 312, therei' is'a co-action between the inclined shelves or wedge sur-i faces'314a iand 317'a on the lugs 314 and 317, respeo tively The nut member 315 can, of course, beinitially positioned and turned to some extent; by, hand, but 'as thelug hub 312 is'moved toward the plain hub 310, the a seal ring315 becomes relatively'tightly wedged in the} i annular grooves 31% and 312b so that it, becomes increas- 1 ingly more difficult to turn the nut member 315 relative:

to the hubs 310 and 312,

7 For tightening thenut member 315 aiter it has'been? 1 I hand-tightened, -an axially-aligned bolt 7320 having a e a wedge head 322 formed integrally or otherwise secured 1 therewith is utilized, The threaded end 320a of the section '211 so as toiprovide access to the flow bean F p l and the other internal parts of the adjustable choke A."

'aklso, it will be'evident that therlateralsurface 40a of the stop'member40 is spaced from the safety'bleeder plug 30 so that after the bolt 26' has been removed and prior to the removal of the plug *30, the limited relative body section 211 can-be efiected so as to permit leakage pastthe sealring 12, as explained above, to give, the

irnovernent'of the'nut member 18 with respect to the" Referring'to Figures 7 through 1 0, the letter A desiga:

nates:,generally the coupling of this invention which is a adaptedito connecttogether'the sections of pipe P (Fig ;ur e 7) flhegcoupling A is fluid-tight so that fluid'mayi passtherethrotlgh from one pipe Pfto .theiothe'r pip'e P, :7-

bolt 320 extends through an opening 323 in the nut mem- 7 her 315 and an internally threadednut325 is in thread 7 V 1 ed engagement-with thebolt' 320 when the bolt 320 is r in'the assembled posiiton. The wedge member 322 has" a substantially arouate shape (Figure 8) so thatit con-j 1 forms tothe internal shape of the, nut member 31 5. One side of the wedge member 322 is substantially disposed, as indicated at 322a, while the other sidefthereof is tapered or inclined at an angle to the longitudinal axis of the coupling A and such inclined side or edge is a 1 identifiedby the numeral322b, 'Ihe substant-ially axial- 1y disposed side 322a is adapted to contact the substan tially straight side 31% of the lugs 317 (Figure 10) The inclined side 322b is adapted to contact an inclineclside' 31% on one of thelugs 314 (Figure'sttand 10). 'As'the nut 325 istigh-tened on the bolt 3zth'thewedge member 1' 5 322 is pulled or moved axially towards the nut 325, and

during. such axialmo-vementofthe bolt 320 and the V wedge member 322 relative to the nut member 315, fla rotative 'torce is applied to the lugi 317i which isfcon-c tacted by the wedge member 322soas to etfect'a turning-I or the nut member 315. Itisthus evident that the niovement of the wedge member 322'and the bolt 32010 the left (Figures 7, and 510,) efiefcts aspreading: aotionube-f'a .1}

tween the lug.- 3-155 and the lug 317 which are contacted by the wedge member 322. Since the pipe P with which the hub 312, having the lugs 314 thereon, ismaintained relatively fixed, the spreading force of the wedge member 322 efiects the movement of the nut member 315 relative to .the coupling 312. However, it willbe evident that if the nut member 325: is held and the pipeP-is free to rotate or turn, then spreading action will result in thernovement of the lug 314 contacted by thewedge member 322, and the hub 312 rather than the nut member 3155 v A safety bleeder plug. 339 is threaded or otherwise secured inan opening 332 in the lughub 31 2. The plug therethrough which is adapted to slowly release the fluid under pressure in the- 330 has. a bleeder passage 333..

coupling A before the disassembly of same; Ordinarily, the nut 338 is in the positionv shown in Figures 7 and 8 and. closes the opening 332. so that. no. fluid: escapes. However, when it is desired to release any fluid pressure present in the coupling A, the bleeder plug 330.is threaded or otherwise turned to establish fiuid communication. between the bore or interior-10f the couplingA and; the. exterior thereof through the bleeder passage 333; Due to the restricted size of. the passage 333, the

pressure is gradually released and ultimately the plug 330.. is removed so that the entire pressure in theinterior ofthe, coupling A, is released. With the plug 33(Lthus out of position andthe pressure within-the coupling.A.1'e-..

leased, the we ge member 322ar1d belt 329. canberemoved from the nut member 335. However, prior. to the. removal of the plug 339, the. wedge member. 322 cannot be removed due to the positioning ofthe plug 330 in alignment with the wedge member 322. Therefore, the plug 33 0,serves to prevent the premature disassembly of; the coupling A prior to the release of thepressure h nthe co plin The wedgernember 322; and bolt: 320; alongwith the. nut;32 5;c an.be utilized for the disassembly or releaseof: the coupling A by removing samefrom theopening323;

in thenutmember 315 and thereafterpositioningthe bolt 320, in opening335 (Figures 81-10,) in the nut member; 315:,so that; the bolt320, nut member. 322 and nut 325:

assume the dotted-line position illustratedin Figure. 10. In,such releasedv position, the substantially. axial. side 322a ofthe wedge member 322 contactsthe substantially axial side314c, ofthelug 3l 4,and the inclinedaortapered' side 3221) of the wedge member 322 contacts a similarly. inclined end 3170 of. one of. the .lugs3117. Thus, as the wedgemember 322. is moved axially toward-thebolt 325 and: relative to the nut member 315, the lugs 314: and 317 are spread or moved away from each other. Assuming'that the hub 312 and the lugs 314 still remain fixed, the. spreading or wedging action of the wedge member 322 will, therefore, turnthe nut member 315 in an opposite direction to that required for the tightening of such coupling A.

In the operation or use of the coupling A. ofthis invention, the nut member 315 is initially positioned around the pipe section P to which the plain hub 310 is to be connected. Then, the plain hub 310 is connected to that septipn of. pipe P and the. lug hub 312 is, cormeeted to the, other section of pipe P. The seal ring3 15 is. positionedbetween the hubs 310 and 312 in; the. annular grooves310b and 31212. and then the annular nut member 315 is moved longitudinally. or axially with the circumferential spaces between the; lugs 317 thereof aligned with thelugs ,314sothat thenutmernber 315;.is moved to the right: (Figure 7): until the lugs317 are disposed to the right of the lug s;3 14 Then the nut member 315 is-turned hand;to cause a sliding wedge action between the inclined-surfaces 314a and 317a of the lugs 314 and 317-.

Asupreyiously explained, thewedging action of the, sur-' faees 314a. and 31 711 effects a tightening; of the-coupling A byrmoving the hubs 310 .and- 312 toward each other-etc ber 315 with the bolt 320 in the opening 323. The nut; 325 is thereafter positioned on thethreads 320a of the bolt 320 and turned for a movementof the wedge member 322axially toward the nutor to the left (-Figure 7'),

As previously explained, such tightening of the nut 325 results in the application of a spreading force on the lugs 314 and 317 which are contacted by the wedge-memher 322 (Figures 8 and 10) so that the nut member 315- is further turned relative to the hubs 310-and 312 and a further wedging action by the sliding movement of the surfaces 314 zand 317a is obtained to assure a uniform tightening of the hubs 310-and 312 with respect to the seal ring 315. It should be notedthat during such tightening, the force on the bolt 320 is in line with the axis thereof and, therefore, there is no tendency to bend or twist the bolt 320. The tightening, therefore, is uniform and a uniform load isapplied to the seal ring 315. Also, the large mechanical advantage gained by the wedging surfaces of the wedge member322 permits the use of a relatively small bolt 320 for the tightening required.-

After the bolt-320 and the wedge member 322-have been positionedin the opening 323 with the nut 325 threaded thereto, the safety bleeder plug 330 is threaded.

into the opening 332 and forms a seal to prevent fluid escape fromthe coupling A. Then, the coupling-isreadyfor; use. These couplings are particularly adapted for high fluid pressure use, audit will be evident that-thebolt- 320-with the wedge member 322 cannot be removed-with the plug 330 threadedin the opening 332.

When itis desired to disassemble the coupling A-, then the bleeder plug 330 must be removed. Thus, the plug 330 serves as a safety factor-in that the fluid pressure in the coupling A is relieved prior to the disassembly of the coupling. As the bleeder plug 330 is threaded out of the opening 332, the bleeder passage 333 is first partiallyexposed andthen completely exposed so that there is a gradual release of thefluid pressure within the coupling A and finally the pressure within the coupling A is equalized with the atmospheric pressure when the plug Figure 10) and the wedge member. 322 is moved toward the nut again to effect an opposite movement to the nut member-315 tothat previously utilized for the tightening operation. nut member;315 is obtained with the wedge member 322-, then the bolt 320 and the wedge member 322' are removed so that the nut member 315 can then be turned for complete disassembly from the hubs 310 and 312;

From the foregoing, it is believed evident, that the safety device S of this invention with the coupling C is adapted for use with various types of equipment, Also, it is believed evident that the. safety device S can be used with various types of couplings. For example, be

sides the specific equipment mentioned above, it shouldv also .be pointed out that the safety device S can be used with couplings such as on Christmas tree caps, Ts, crosses,

and alsoscraper trap closures. r 1

Theforegoing disclosure and description of theinvention,is illustrative and explanatory thereof andvarious changesinthe size,,shape and materials, as well as -inthe, detai .ofithe. illustrat dmus r fion, m y be made the.

Once the initial releasing movement of the Whatis-claimedisr 7 7 r 1.1 t e op th r -app ed a m wi ho p r i from the spirit of the invention: V

'i .lyA-'couplingcomprising, a lu g hub having-spaced external segmental lugs thereon, a plain hub, adapted to bepositioned adjacent said lug hub; a seal ring between said. 7

lug hub and said plain hub, a nut member having spaced internal segmental lugs thereom'the lugs on said nut memher and on said lug hub having inclined surfaces engageable with each other for obtaininga relative movement therehetween upon a relative rotational movement there'- between, coacting shoulders on said nut member and said plainhub engageable with each other whenrsaid inclined surfaces of the lugs on said lug hub and said nut member .aregin engagement whereby upon a turning of the nutmember relative to said lugrhub; the lug hub and the plain ring between the plain hub and the lug hub to thereby prevent fluid from escaping from the interiors of said hubs, one of said hubs havingan opening through the wall thereof,;a safetyble'eder plug releasably mounted in said.

opening,- said plug having a bleeder passage therethrough hub areurgedtoward each other ;to compress the seal .for establishingfluid-communication between the interior andtheexterior of saidoneof said-hubs for gradually releasing the fluid pressure within said hubs, means fornormally sealing said bleederpassage'closed to prevent theescape'of'the fluid pressurewithinfsaid'hubs, and a stop meanson said, nut member adapted to engage saidi plug to prevent sufiicientrelative turning of saidnnt ment-- ber and saidlug hub; for the releasing of the nut member m' d: h1 b-:r w -r ,7 r 2. 'I'hestr ubtur'e set forth in claim 1 wherein, said-stop; means 7 normally i-positioned out of .engagementiwith said bleeder; plug asufiicient distance. to enable alimited;

relative turning Ofgtil e nut member. and lug 'hub or re 3. -;A couplingcomprlsilig, 1a lughub having spaced external'seg'mental lugs thereon, a plain hub adapted tojbe; positioned'adjacent said lug hubga nut-memberhaving hole throughthe wall of one of the coupling parts, a wrench part spaced from its threaded portion, and a weakened section intermediate the threaded portion and wrench part which will permit the plug to shear at the; a

weakened portion upon the application of excessive torque to thewrench-part.- i t I 1 5. A coupling comprising, a lug hub having spaced ex-,

ternal segmental lugs thereon, a plain hub adapted to be V positioned adjacent said lug hub, a nut member having. spaced internal segmental lugs thereon, the lugs on said nut member and on said lug hub having inclined surfaces engageable with each other for obtaining a relative movement therebetween upon a relative rotational movement thereb'etween, coacting shoulders on said nut member and tion. which isthreaded into said opening for gradually 3Q 'turningof said member and said'lug hub for the releasing; w of the nut member from said lug hub until the safety releasingthe. fiuid pressure within said hubs a weakened T l section intermediate the threaded portion and wrench- 1 part which will permit the plug to shear at the weakened portion upon the application of excessive torque 'to thef wrench part,- and stop means on said. nut member'adapted to engagesaid safety means toprevent sufficient relative meansis removed.

rleasingenough of the compression on the seal ring to t t V permit-the fluid pressure within the hubs'to gradually; 'eseapearoundsaid seal ringwith; a signalling noise for; 'thereby-warningthe operator that said'bleeder plug has net-been-removed. 40

spaced internal segmental lugs thereon the lugs on said nut member and on saidlng hub 'hav ing inclined surfaces engageable with each other forobtainingarelative-move-,

ment therebetweenupon a relative rotational movement therebetween, coacting; shoulders on'saide nut member and said plain hub engageable witheach other when'said in+=- clined surfaces of th'e'lugs on saidlug hub andsaid nut.- "member are in en'gajgement whereby'upon a turning of r the nut memberrelative to said lug'hub, the lug hub the 'plain hub are urged toward ach 0ther to"seal therebetween and thereby prevent fluid: from escaping from the interiors of said hubs, one" of saidehubsihaving an opening throughfl e Wall'thereof, safety means including t a bleederplug releasably mounted in' saidopeningjor; I gradually releasing the fluid 'pressure withinsaid l;|ubs,-

and stop means on said nut member adaptedfto engage; saidsafety means to prevent suflicient relative turning t I ,ofsaid nutmember and said lug hubforthe releasing of;

Lathe-nut member from said lug hubjuntil the-safety means isremoved.

' V r In a coupling of the type employing segmental lugs havin'g c omplementaryt engageable sticking taper wedge- V surfa'cesithereon "for making up the 'couplingfupon ten;

tive rotation q lhe lug carrying parts theimprovement i h 'i r s hfi tombl l fi re i h 79i s et I means; preventing relative rotation of the plug carrying parts'a sufijoient distance to disengage the lug wedge sur faces until pressnre 'within the coupling has been bledf 16. The coupling of'claim'3 wherein the-safety'me'ans includes. a wedge member inserted between confronting I lugs on the lug hub and nut and the stop means is saidnut 1 lug, said opening positioned so'that the bleeder plug ob-f structs removal of the wedge and thereby limits rotation ofthe nut until thebleeder plug is removed.

7; The coupling of claim' 3. wherein the safety j includes awedge member inserted between confronting lugs on' the lug hub and nut'and the stop'means i's'said; r

nut lug,'said opening positioned'so that the bleeder plug obstructs removal of the wedge I andthereby rota .tion of the nut until the bleeder plug is removed, said wedge additionally. providing means for tightening the coupling.

7 The ionising of .claini 3 wherein the sa etfmeansi includes'ia wedge member inserted between lconfrontingij v lugs on the lughub and'nut and the stop means is said.

nut lug, said opening positioned so thatthe bleeder plug obstructs removal of thewedge 'andthe'rebylimits rotae'; tion of the nut until the bleederplug 'is, removed, said Wedge additionally providing means for tightening th'e; coupling and insertablelbetween other confronting hub and nut lugs to loosen-the nut. A couplingadaptedrto connect sections. of pipeyt'ot gether comprising, hub means connected to the pipe see- 2 tions'to' be connected together, a nut memberhaving;

means thereon forengaging saidhub means for efieeting a connection of the hub means upon a turning of said;

off, s aidsafety means'including a'bleder plug carried by" cenpmtg whien when removed ts permit disassembly' j "of the ciguplingljleed's'dowfi pressure vvithin 'thecpuplingj saidbledr'plugjhavingathreaded portion secured in a:

nut member with respect Qto said hub means, wedge, means axially movable relativeto said nut member for said nut member with respect to said hub means whereby ,a connect on ofrtheihub' means and the pipe sections gis effected, a threaded hole in the hub means, and a' bleeder:

V plug in said hole normally sealing said holeand blockingi movement of the wedgejmeans in a direction to'permiti release of the qouplingfw y d P1 8 m t r I movedpr-ior to the release of the coupling.

adapted to be ctiupledtogethensaid first member carry member carrying spaced external lugs' thereon, said lugsl j I 'whe'ri'rotated relative toleachother to a first Q;

said plain hub engageable with each other when said ina 10. A "couphng comprising, first?and second member'sj i permitting separation of said members and when rotated to a second position preventing separation of said members, said lugs having coacting inclined surfaces whereby when rotated to said second position the members are urged toward each other to seal therebetween to prevent fluid from escaping from the interior of said members, said second member having an opening through the wall thereof, safety means including a bleeder plug releasably mounted in said opening for gradually releasing the fluid pressure within said members, and stop means on said first member adapted to engage said safety means to prevent suflficient relative turning of said first and second members for the releasing of said second member from said first member until the safety means is removed.

11. A coupling comprising, first and second members adapted to be coupled together in pressure tight relationship, means sealing between the members when they are coupled together, coacting lug parts carried by each member which when rotated to a released position permit separation of said members and when rotated to an engaged position prevent separation of said members, and safety means preventing relative rotation and release of said members until the interior of the coupling has been vented to atmosphere including a threaded aperture extending completely through the wall of said first member, a bleed plug releasably secured in said aperture in pressure tight releationship therewith, means on said plug projecting externally beyond the outer surface of said one member, and a lug carried by the second member and engaging the plug when the members are rotated toward released position to thereby prevent release of the coupling members until the plug has been removed.

12. The coupling of claim 3 wherein the safety means includes a bar member inserted between confronting lugs on the lug hub and nut and the stop means is said nut lug, said bleeder plug releasably maintaining the bar between the confronting lugs to thereby limit rotation of the nut relative to the lug hub.

References Cited in the file of this patent UNITED STATES PATENTS 228,209 Meier June 1, 1880 266,359 Gotzel Oct. 24, 1882 350,844 Rollins Oct. 12, 1886 896,503 Bouchard Aug. 11, 1908 1,233,172 Berry July 10, 1917 1,510,000 Gold Sept. 30, 1924 1,583,396 De Muth May 4, 1926 1,663,755 Gammeter Mar. 27, 1928 1,859,251 Brown May 17, 1932 1,890,011 Wirz Dec. 6, 1932 2,025,112 Laurent Dec. 24, 1935 2,165,163 Waters July 4, '1939 2,208,353 Wooley July 16, 1940 2,245,847 Bagby June 17, 1941 2,511,308 Tropper June 13, 1950 2,614,724 Wyman Oct. 21, 1952 2,689,754 Dunton Sept. 21, 1954 2,726,104 Boitnott Dec. 6, 1955 2,740,974- Lewis Apr. 10, 1956 2,744,771 Laurent May 8, 1956 2,753,197 Loeflier July 3, 1956 2,869,752 Hall Jan. 20, 1959 FOREIGN PATENTS 302,787 Great Britain Dec. 27, 1928 874,691 France May 18, 1942 565,307 Great Britain Nov. 6, 1944 828,335 Germany Jan. 17, 1952 

